refactor(*): use `uglify` task     - add `uglify` task to “Gruntfile.js”     - remove `concat:root` task from “Gruntfile.js”     - update `build` task
refactor(*): use `uglify` task
    - add `uglify` task to “Gruntfile.js”
    - remove `concat:root` task from “Gruntfile.js”
    - update `build` task

ChristianGrete/polymer-mustache-template,ChristianGrete/polymer-mustache-template,ChristianGrete/polymer-mustache-template,ChristianGrete/polymer-mustache-template